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can someone please check this tuning frequency?

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jacko

jacko
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rogers, MN
-1 box

-(1) 15" L7

-4.25cu ft after bracing/sub displacement,

-(4) 3" pieces of PVC(3" is outside diameter, inside dia is 2.5" I think), 12in long each.

-30hz tuning freq.

Side question... Are (4) 3" pvc ports enough to prevent port noise with 550wrms to this sub?

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